In Layout the "SketchUp Model" is not activated

With the viewport activated, the SketchUp Model on the tray is gray out. Why is that?
See attached Layout file.
Untitled.layout (266.3 KB) Thank you.

Because you have a .png file not a .skp file as the reference. By the reference and the way it’s grouped, it looks like you exploded the viewport after you added the .skp file to the LO document.

Exploding the viewport converts it to a .png image and totally disconnects it from the SketchUp file. If you want to maintain the link to the .skp file, don’t explode the viewport.

Thanks a lot Dave!!! Right on.
I am a little embarrassed, using SU for so long and I didn’t even noticed the exploded viewport.
Chris B.